O.S. Engines GT55 - Manual (Page 8)

14
Precautions
Do not disassemble the ignition module and plug cap.
(The ignition module is irreparable. Replace it when
necessary.)
Be careful not to mount the ignition module so that it can
be hit by water, gasoline or exhaust.
Avoid using the engine when the external temperature is
over 40 C.
Do not move the rpm sensor as it is placed at it's optimum
position, otherwise the engine will not run properly.
Do not pull on the high tension cord to remove the plug
cap, or the wire will break. Be sure to hold the plug cap to
remove it.
Do not connect nor disconnect the rpm sensor with the
ignition module on, or there is a possibility it will fire and
the engine start.
Check the ignition module for spark when installing the
plug cap on the plug and be careful about getting a shock.
Make sure there is no flammable material or gasoline
vapors near by that could ignite.
Do not turn the propeller with the ignition module on, or
there is a possibility the engine will start.
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Never touch, or allow any object to come into
contact with the rotating propeller and do not
crouch over the engine when it is running.
Install a top-quality propeller of the diameter and
pitch specified for the engine and aircraft.
Do not use a nylon propeller. It has the possibility
of flying apart due to strong centrifugal force
caused by high rpm.
Discard any propeller which has become split,
cracked, nicked or otherwise rendered unsafe.
Never attempt to repair such a propeller: destroy
it. Do not modify a propeller in any way.
PROPELLER
Use a wooden or a carbon fiber propeller.
Do not use a nylon propeller.
The choice of propeller depends on the design and weight
of the aircraft and on the type of flying in which you will be
engaged. Determine the best size and type after practical
experimentation. As s starting point, refer to the props listed
in the table shown below. Slightly larger, or even slightly
smaller props than those shown in the table may be used,
but remember that propeller noise will increase if blade tip
velocity is raised due to high rpm or if a larger
diameter/lower pitch prop is used. Be well aware propeller
rotating arc is very large due to a large propeller used with
this engine. Carry out the needle adjustments only after
stopping the engine. Do not allow your face or hands to
come close to the rotating prop.
Type Size (DxP)
Running-in
Sport/Acro/Scale
Warning:
Make sure that the propeller is well balanced. An
unbalanced propeller and/or spinner can cause serious
vibration which may weaken parts of the airframe or affect
the safety of the radio-control system.
Do not use any propeller which has become split, cracked
or nicked even very slightly, or received strong impact
even if no apparent damage is visible.